MP7 massive gas leak

I'm having a major malfunction with my fairly new MP7 GBB. It had been working great right out of the box for a couple of months. A few weeks ago, I was firing it in cold weather and after a few shots, all of the gas in the magazine vented explosively out of the ejection port after the last shot.

I thought maybe it was a problem with the magazine, so I ordered a new one. I just field stripped, cleaned and lubed the gun, loaded and installed the new magazine and test fired it. The first time I pulled the trigger, all the gas in the magazine immediately vented out of the ejection port, again! Guess it wasn't the mag after all.

Any ideas on what, if anything, I can do to fix this problem?? Thanks!

I'm having a major malfunction with my fairly new MP7 GBB. It had been working great right out of the box for a couple of months. A few weeks ago, I was firing it in cold weather and after a few shots, all of the gas in the magazine vented explosively out of the ejection port after the last shot.

I thought maybe it was a problem with the magazine, so I ordered a new one. I just field stripped, cleaned and lubed the gun, loaded and installed the new magazine and test fired it. The first time I pulled the trigger, all the gas in the magazine immediately vented out of the ejection port, again! Guess it wasn't the mag after all.

Any ideas on what, if anything, I can do to fix this problem?? Thanks!

Hi MRP - Welcome to the KWA Forums. Sorry you are having issues. The best thing to do is to send it for warranty repair. Because you gun was distributed by Umarex they will handle the work. Since Umarex gives a 1 year warranty, you should have any issues so long as you have not violated the warranty.